EP3690969B1

EP3690969B1 - Manufacturing method of an all-solution oled device

Info

Publication number: EP3690969B1
Application number: EP17926992.3A
Authority: EP
Inventors: Ting Shi
Original assignee: Shenzhen China Star Optoelectronics Semiconductor Display Technology Co Ltd
Current assignee: Shenzhen China Star Optoelectronics Semiconductor Display Technology Co Ltd
Priority date: 2017-09-29
Filing date: 2017-11-20
Publication date: 2023-11-08
Anticipated expiration: 2037-11-20
Also published as: WO2019061753A1; EP3690969A1; CN107623076A; KR20200058532A; CN107623076B; US10756273B2; KR102322637B1; PL3690969T3; EP3690969A4; JP6901631B2; US20190229298A1; JP2020534656A

Description

FIELD

The disclosure relates to the field of display technology, in particular to an all-solution OLED device and a manufacturing method thereof. The disclosure relates to a display technical field, and more particularly to a display panel and a display device.

BACKGROUND

The organic light emitting diode (OLED) display apparatus is recognized by the industry as the most promising display device due to many advantages such as self-luminousness, low driving voltage, high luminous efficiency, short response time, high resolution and contrast, viewing angle nearly 180°, wide temperature range, and capability of achieving the flexible display and large-area panchromatic display.
According to the driving mode, OLED can be classified into a passive matrix OLED (PMOLED) and an active matrix OLED (AMOLED), i.e., direct addressing and thin film transistor matrix addressing. Among them, AMOLED has a matrix arrangement of pixels, belonging to the active display type; due to the high luminous efficiency, AMOLED is usually used for high-definition large-size display apparatus.
The OLED generally includes a substrate, an anode disposed on the substrate, a hole injection layer disposed on the anode, a hole transport layer disposed on the hole injection layer, and a light emitting layer disposed on the hole transport layer, an electron transport layer on the light emitting layer, and a cathode disposed on the electron transport layer. The principle of light-emitting OLED display devices is that emit light by carrier injection and recombination under an electric field. Specifically, an OLED display device generally adopts an ITO pixel electrode and a metal electrode as an anode and a cathode of the device respectively. Under a certain voltage, electrons and holes are injected from the cathode and the anode into the electron transport layer and the hole transport layer respectively; the electrons and holes migrate to the light emitting layer through the electron transport layer and the hole transport layer respectively, and meet in the light emitting layer to form excitons to excite the light-emitting molecules, which emit visible light through radiation relaxation.
The most common manufacturing method of the OLED device is that preparing a hole injection layer, a hole transport layer, and a light emitting layer by ink-jet printing and preparing an electron transport layer and a cathode by vacuum thermal evaporation; due to the high cost of the vacuum thermal evaporation, a high production cost of the OLED device is caused, so a large-scale commercialization of the OLED device is limited. The ink-jet printing method uses a plurality of nozzles to drop the ink of the functional material into a predetermined pixel area, and then the desired film is obtained by drying. The method has the advantages of high material utilization and the like, and is a key technology for solving the problem of the display cost of a large-size OLED. However, due to the mutual miscibility between the adjacent printing ink layers, and the materials of the electron transport layer and the cathode are mostly the evaporation materials, it is very difficult to achieve an all-solution-process OLED device.
US 2017/207406 A1 is a related prior art for this field. More particularly, US 2017/207406 A1 discloses a quantum dot light emitting diode, a display apparatus, and a manufacturing method are provided. The manufacturing method includes forming a first electrode, a first functional layer, a buffer layer, a quantum dot layer, a second functional layer and a second electrode on a base substrate sequentially, wherein the first functional layer is made from organic material, a material for the buffer layer includes a polar organic solvent, and forming the quantum dot layer includes forming a solution including quantum dots and a non-polar organic solvent above the buffer layer using inkjet printing method, the non-polar organic solvent and the polar organic solvent are capable of dissolving each other; and removing the polar organic solvent and the non-polar organic solvent to form the quantum dot layer.
US 2008/015269 A1 is a related prior art for this field. More particularly, US 2008/015269 A1 discloses a salt comprised of a polyionic conjugated polymer comprising a plurality of first charges; and a plurality of counterions, each of said plurality comprising a charged moiety electronically linked to at least one charge-distributing moiety, said charged moiety having a charge opposite in sign to that of the first charge. These polyionic conjugated polymers having different electronic and/or optical properties.
US 2017/194566 A1 is a related prior art for this field. More particularly, US 2017/194566 A1 discloses a method of making an electrode for an organic electronic device comprises the steps of depositing an ink on a light emitting layer, and drying said ink to form said electrode. The ink comprises conductive metal or carbon particles, a binder and a hydrocarbon solvent selected from 1, 1' -bicyclohexyl, cis-decalin trans-decaiin or n-undecane.
WO 2012/177673 A2 is a related prior art for this field. More particularly, WO 2012/177673 A2 discloses methods for forming organic layers for an organic light-emitting device (OLED) using an inkjet printing or thermal printing process. The method can further use one or more additional processes, such as vacuum thermal evaporation (VTE), to create an OLED stack. OLED stack structures are also provided wherein at least one of the charge injection or charge transport layers is formed by an inkjet printing or thermal printing method at a high deposition rate. The structure of the organic layer can be amorphous, crystalline, porous, dense, smooth, rough, or a combination thereof, depending on deposition parameters and post-treatment conditions. An OLED microcavity is also provided and can be formed by one of more of the methods.
The object of the disclosure is to provide a manufacturing method of an all-solution OLED device. A hole injection layer, a hole transport layer, a light emitting layer, an electron transport layer and a cathode are fabricated by a solution film-forming method, so as to avoid the use of high vacuum evaporation process and equipment, thereby saving materials and reducing manufacturing costs.
The object of the disclosure is also to provide an all-solution OLED device, a hole injection layer, a hole transport layer, a light emitting layer, an electron transport layer and a cathode thereof are all fabricated by a solution film-forming method, so the manufacturing cost is low and the display quality is excellent.
In order to achieve the object, the invention provides a manufacturing method as recited in claim 1.
Optionally, the areas of the plurality of openings are respectively smaller than the areas of the plurality of anodes; the plurality of openings respectively correspond to a plurality of pixel regions; the material of plurality of anodes is indium tin oxide; the plurality of anodes are fabricated by way of magnetron sputtering film formation, the film thickness of the plurality of anodes is between 20 nm and 200 nm;

the ink of the hole injection layer is a PEDOT: PSS aqueous solution; the solution film-forming method of the plurality of hole injection layers is ink-jet printing; a drying method of the plurality of hole injection layers includes one or two of vacuum drying and heat drying; and a thickness of the plurality of hole injection layers is between 1 nm and 100 nm.
the ink of the hole transport layer includes a hole transport layer material and a solvent thereof, the material of the hole transport layers is poly (N, N'- bis (4-butylphenyl) -N, N'- bis (phenyl) benzidine), and the solvent is an organic solvent; the solution film-forming method of the plurality of hole transport layers is ink-jet printing; a drying method of the plurality of hole transport layers includes one or two of vacuum drying and heat drying; and a thickness of the plurality of hole transport layers is between 1 nm and 100 nm;
the ink of the light emitting layer includes a light emitting layer material and a solvent, the material of the light emitting layer is a blue light emitting material, wherein the material of the blue light emitting layers includes poly(9,9-di-n-octylfluorenyl-2,7-diyl), and the solvent is an organic solvent; the plurality of light emitting layers. The solution film-forming method of the layer is ink-jet printing. the drying method of the plurality of light emitting layers includes one or two of vacuum drying and heat-drying. The film thickness of the plurality of light emitting layers is between 1 nm and 100 nm.

Optionally, the ionic conjugated polyelectrolyte is a cationic conjugated polyelectrolyte and the cationic conjugated polyelectrolyte has a structural formula of
and the alcohol solvent is methanol;

the solution film-forming method of the plurality of electron transport layers is ink-jet printing; a drying method of the plurality of electron transport layers includes one or two of vacuum drying and heat drying; and a thickness of the plurality of electron transport layers is between 0.5 nm and 10 nm.
a material of the metal microparticles is silver; the solution film-forming method of the plurality of anodes is ink-jet printing; a drying method of the plurality of anodes includes one or two of the vacuum drying and the heat drying; a thickness of the plurality of anodes is between 10 nm and 200 nm; and a top of the pixel definition layer is a rough surface.

The disclosure further provides an all-solution OLED device, including: a base substrate, a TFT array layer disposed on the base substrate, a plurality of anodes disposed on the TFT array layer and disposed at intervals, a pixel definition layer disposed on the TFT array layer and the plurality of anodes, a plurality of openings disposed on the pixel definition layer and respectively corresponding to the plurality of anodes, a plurality of hole injection layers respectively disposed in the plurality of openings and located on the plurality of anodes, a plurality of hole transport layers respectively disposed in the plurality of openings and located on the plurality of hole injection layers, a plurality of light emitting layers respectively disposed in the plurality of openings and located on the plurality of hole transport layers, a plurality of electron transport layers respectively disposed in the plurality of openings and located on the plurality of light emitting layers, and a cathode covered on an entire surface of the pixel definition layer and the plurality of electron transport layers and distributed continuously and uninterruptedly;

the plurality of hole injection layers, the plurality of hole transport layers, the plurality of light emitting layers, the plurality of electron transport layers, and the cathode are fabricated by a solution film-forming method;
the material of the plurality of electron transport layers includes an ionic conjugated polyelectrolyte; and a material of the cathode includes metal microparticles and a binder.
the areas of the plurality of openings are respectively smaller than the areas of the plurality of anodes; the plurality of openings respectively correspond to a plurality of pixel regions; the material of the plurality of anodes is indium tin oxide; the plurality of anodes are fabricated by way of magnetron sputtering film formation, and the film thickness of the plurality of anodes is between 20 nm and 200 nm;
the material of the hole injection layer includes PEDOT: PSS; and a thickness of the hole injection layers is between 1 nm and 100 nm.
a material of the hole transport layer includes poly (N,N'-bis(4-butylphenyl)-N,N'-bis (benzeneyl)benzidine); a thickness of the plurality of hole transport layers is between 1nm and 100 nm;
the light emitting layer is a blue light emitting layer, and a material of the blue light emitting layer includes poly(9,9-di-n-octylfluorenyl-2,7-diyl); and a thickness of the plurality of light emitting layers is between 1 nm and 100 nm.
the ionic conjugated polyelectrolyte is a cationic conjugated polyelectrolyte and the cationic conjugated polyelectrolyte has a structural formula of
and a thickness of the plurality of electron transport layers is between 0.5 nm and 10 nm.
a material of the metal microparticles is silver; a thickness of the plurality of anodes is between 10 nm and 200 nm; and a top of the pixel definition layer is a rough surface.

The beneficial effect of the disclosure is that the manufacturing method of the all-solution OLED device of the disclosure adopts the solution film-forming method to fabricate a hole injection layer, a hole transport layer, a light emitting layer, an electron transport layer and a cathode. Compared with the manufacturing method of the existing OLED device, an all-solution preparation of the electron transport layer and the cathode is achieved, the use of high vacuum evaporation process and equipment can be avoided, thereby saving materials and reducing manufacturing costs; and adjacent layers will not appear mutual solubility, so the film quality is high and the performance of the device can be improved. The hole injection layer, the hole transport layer, the light emitting layer, the electron transport layer, and the cathode are all fabricated by solution film-forming; compared with the existing OLED device, the fabrication cost is low, the film-forming quality is high, and the display quality is excellent.
For further understanding of the features and technical contents of the disclosure, reference should be made to the following detailed description and accompanying drawings of the disclosure. However, the drawings are for reference only and are not intended to limit the disclosure.

BRIEF DESCRIPTION OF DRAWINGS

The technical proposal of the disclosure and other advantageous effects will be apparent from the following detailed description of specific embodiments of the disclosure taken in conjunction with the accompanying drawings.
In the drawings,

FIG. 1 is a flow chart of a manufacturing method of an all-solution OLED device of the disclosure;
FIG. 2 is a schematic diagram of step S1 of the manufacturing method of an all-solution OLED device of the disclosure;
FIG. 3 is a schematic diagram of step S2 of the manufacturing method of an all-solution OLED device of the disclosure;
FIG. 4 is a schematic diagram of the step S3 of the manufacturing method of an all-solution OLED device of the disclosure;
FIG. 5 is a schematic diagram of the step S4 of the manufacturing method of an all-solution OLED device of the disclosure;
FIG. 6 is a schematic diagram of step S5 of the manufacturing method of an all-solution OLED device of the disclosure;
FIG. 7 is a schematic diagram of step S6 of the manufacturing method of an all-solution OLED device of the disclosure and is a schematic structural view of the all-solution OLED device of the disclosure.

DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS

To further illustrate the technical means adopted by the disclosure and the effects thereof, the following describes in detail the preferred embodiments of the disclosure and the accompanying drawings.
Referring to FIG. 1, the disclosure provides a manufacturing method of an all-solution OLED device, including the steps as follows.
In step S1, as shown in FIG. 2, a TFT backplane 1 is provided. The TFT backplane 1 includes a base substrate 10, a TFT array layer 20 disposed on the base substrate 10, a plurality of anodes 30 disposed on the TFT array layer 20 and disposed at intervals, and a pixel definition layer 40 disposed on the TFT array layer 20 and the plurality of anodes 30, and the pixel definition layer 40 includes a plurality of openings 41 respectively corresponding to the plurality of anodes 30.
Specifically, the plurality of openings 41 respectively correspond to a plurality of pixel regions.
Specifically, the areas of the openings 41 are respectively smaller than the areas of the plurality of anodes 30, ensuring that the bottoms of the openings 41 are covered with the anode material.
Specifically, the material of the plurality of anodes 30 is indium tin oxide (ITO). The plurality of anodes 30 are fabricated by way of magnetron sputtering film formation, and the film thickness of the plurality of anodes 30 is between 20 nm and 200 nm.
In step S2, as shown in FIG. 3, an ink of the hole injection layer is provided. A solution film formation is performed respectively on the plurality of anodes 30 in the plurality of openings 41 by ink-jet printing or coating, and a plurality of hole injection layers 50 are formed by drying and removing the solvent.
Specifically, the ink of the hole injection layer is a PEDOT: PSS aqueous solution.
Preferably, the solution film-forming method of the plurality of hole injection layers 50 is ink-jet printing.
Specifically, the drying method of the plurality of hole injection layers 50 includes one or two of vacuum drying and heat drying. Preferably, the drying method of the plurality of hole injection layers 50 is vacuum drying.
Specifically, the thickness of the hole injection layers 50 is between 1 nm and 100 nm.
In step S3, as shown in FIG. 4, an ink of the hole transport layer is provided. A solution film formation is performed respectively on the plurality of hole injection layers 50 in the plurality of openings 41 by ink-jet printing or coating, and a plurality of hole transport layers 60 are formed by drying and removing the solvent.
Specifically, the ink of the hole transport layer includes a hole transport layer material and a solvent, and the material of the hole transport layers is poly(N,N'-bis (4-butylphenyl)-N,N'-bis(phenyl)-benzidine)(Poly-TPD), and the solvent is an organic solvent; preferably, the organic solvent includes one or more of toluene, chloroform, and chlorobenzene.
Preferably, the solution film-forming method of the plurality of hole transport layers 60 is ink-jet printing.
Specifically, the drying method of the plurality of hole transport layers 60 includes one or two of vacuum drying and heat drying. Preferably, the drying method of the plurality of hole transport layers 60 is vacuum drying.
Specifically, the thickness of the hole transport layer 60 is between 1 nm and 100 nm.
Since the material PEDOT: PSS of the hole injection layer 50 is water-soluble and the material of the hole transport layer Poly-TPD is organic solvent-dissolving, the hole injection layer 50 and the hole transport layer 60 do not mutually dissolve. In addition, the material Poly-TPD of the hole transport layer 60 is cross-linked and polymerized when it is fabricated, and therefore will not be dissolved by the solvent of the subsequent light emitting layer 70 to prevent miscibility.
In step S4 , as shown in FIG. 5, an ink of the light emitting layer is provided. A solution film formation is performed respectively on the plurality of hole transport layers 60 in the plurality of openings 41 by ink-jet printing or coating, and a plurality of light emitting layers 70 are formed by drying and removing the solvent.
According to the invention, the ink of the light emitting layer includes a light emitting layer material and a solvent, the material of the light emitting layer is a blue light emitting material, and the material of the blue light emitting layers includes poly(9,9-di-n-octylfluorenyl-2,7-diyl)(PFO), and the solvent is an organic solvent; preferably, the organic solvent includes one or more of toluene, chloroform, and chlorobenzene; according to the invention, the organic solvent is chlorobenzene.
Preferably, the solution film-forming method of the plurality of light emitting layers 70 is ink-jet printing.
Specifically, the drying method of the plurality of light emitting layers 70 includes one or two of vacuum drying and heat drying; preferably, the drying method of the plurality of light emitting layers 70 is vacuum drying.
Specifically, the thickness of the plurality of light emitting layers 70 is between 1 nm and 100 nm.
In step S5, as shown in FIG. 6, an ink of the electron transport layer is provided. A solution film formation is performed respectively on the plurality of light emitting layers 70 in the plurality of openings 41 by ink-jet printing or coating, and a plurality of electron transport layers 80 are formed by drying and removing the solvent;
the ink of the electron transport layer includes an electron transport layer material and a solvent, and the material of the electron transport layers is an ionic conjugated polyelectrolyte, and the solvent is an alcohol solvent.
The ionic conjugated polyelectrolyte is a soluble electron-transporting material that has been proved to have excellent electron transport properties in OLED and OPV (Organic Photovoltaic) devices and can significantly improve device performance.
Preferably, the ink of the electron transport layer further includes a viscosity modifier and a surface tension modifier to further adjust the physical properties of the ink and improve the printing effect.
Since the solvent for the material of the light emitting layer PFO is an organic solvent such as toluene, chloroform, and chlorobenzene, the cationic conjugated polyelectrolyte has an alcohol-soluble property and does not dissolve in an organic solvent such as toluene, chloroform, and chlorobenzene, and the material of the light emitting layer PFO does not dissolve in the alcohol solvent, and therefore, the electron transport layer 80 and the light emitting layer 70 do not mutually dissolve.
Preferably, the ionic conjugated polyelectrolyte is a cationic conjugated polyelectrolyte, and the cationic conjugated polyelectrolyte has a structural formula of
and the alcohol solvent is methanol.
Preferably, the solution film-forming method of the plurality of electron transport layers 80 is ink-jet printing.
Specifically, the drying method of the plurality of electron transport layers 80 includes one or two of vacuum drying and heat drying. Preferably, the drying method of a plurality of electron transport layers 80 is vacuum drying and then drying by heat.
Specifically, the thickness of the plurality of electron transport layers 80 is between 0.5 nm and 10 nm.
In step S6, as shown in FIG. 7, a metal paste material is provided, and the entire surface of the electron transport layer 80 in the pixel definition layer 40 and the plurality of openings 41 is performed a solution film formation by ink-jet printing or coating, and a continuous uninterrupted cathode 90 by drying and removing the solvent;

the metal paste material includes metal microparticles, a binder, a solvent, and an auxiliary agent;
Preferably, the auxiliary agent is a viscosity regulator.

Preferably, the material of the metal microparticles is silver (Ag).
Preferably, the solution film forming method of the cathode 90 is ink-jet printing.
Specifically, the drying method of the cathode 90 includes one or two of vacuum drying and heat drying. Preferably, the drying method of the cathode 90 is vacuum drying.
Specifically, the thickness of the cathode 90 is between 10 nm and 200 nm.
Preferably, the top of the pixel definition layer 40 is a rough surface facilitating the attachment of the metal paste material to form a continuous uninterrupted cathode 90.
Specifically, in the solution film formation process of the hole injection layer 50, the hole transport layer 60, the light emitting layer 70, the electron transport layer 80 and the cathode 90, the coating method is spin coating or blade coating.
According to the invention, in the dry process of the hole injection layer 50, the hole transport layer 60, the light emitting layer 70, the electron transport layer 80, and the cathode 90, when the two adjacent structural layers are both dried by heating, the heating temperature of the structure layer of the back-end process is less than the heating temperature of the structural layer of the front-end process.
In the manufacturing method of the all-solution OLED device, the hole injection layer 50, the hole transport layer 60, the light emitting layer 70, the electron transport layer 80 and the cathode 90 are fabricated by the solution film-forming method. Compared with the manufacturing method of the existing OLED device, an all-solution fabrication of the electron transport layer 80 and the cathode 90 is achieved, the use of high vacuum evaporation process and equipment can be avoided, thereby saving materials and reducing manufacturing costs; and the adjacent layers will not appear mutual solubility, so the film quality is high and the performance of the device can be improved.
Referring to FIG. 7, according to embodiments not falling within the scope of the invention, the disclosure further provides an all-solution OLED device, including: a base substrate 10, a TFT array layer 20 disposed on the base substrate 10, a plurality of anodes 30 disposed on the TFT array layer 20 and disposed at intervals, a pixel definition layer 40 disposed on the TFT array layer20 and the plurality of anodes 30, a plurality of openings 41 disposed on the pixel definition layer 40 and respectively corresponding to the plurality of anodes 30, a plurality of hole injection layers 50 respectively disposed in the plurality of openings 41 and located on the plurality of anodes 30, a plurality of hole transport layers 60 respectively disposed in the plurality of openings 41 and located on the plurality of hole injection layers 50, a plurality of light emitting layers 70 respectively disposed in the plurality of openings 41 and located on the plurality of hole transport layers 60, a plurality of electron transport layers 80 respectively disposed in the plurality of openings 41 and located on the plurality of light emitting layers 70, and a cathode 90 covered on an entire surface of the pixel definition layer 40 and the plurality of electron transport layers 80 and distributed continuously and uninterruptedly;
the hole injection layer 50, the hole transport layer 60, the light emitting layers 70, the electron transport layers 80, and the cathode 90 are all fabricated by the solution film-forming method.
The material of the plurality of electron transport layers 80 includes an ionic conjugated polyelectrolyte, and the material of the cathode 90 includes metal microparticles and a binder.
Specifically, the solution film formation method is ink-jet printing or coating, and the coating method is spin coating or blade coating.
Specifically, the areas of the openings 41 are respectively smaller than the areas of the plurality of anodes30, ensuring that the bottoms of the openings 41 are covered with the anode material.
Specifically, the plurality of openings 41 respectively correspond to a plurality of pixel regions.
Specifically, the material of the plurality of anodes 30 is indium tin oxide(ITO). The plurality of anodes 30 are fabricated by way of magnetron sputtering film formation, and the film thickness of the plurality of anodes 30 is between 20 nm and 200 nm.
Specifically, the material of the hole injection layer includes PEDOT: PSS; and a thickness of the hole injection layers is between 1 nm and 100 nm.
Specifically, the material of the hole transport layer 60 includes poly(N'-bis (4-butylphenyl)-N,N'-bis(phenyl) -benzidine)(Poly-TPD); and a thickness of the plurality of hole transport layers is between 1 nm and 100 nm.
Specifically, the light emitting layer is a blue light emitting layer 70, the material of the blue light emitting layer include Poly (9,9-di -n-octylfluorenyl-2,7-diyl ) (PFO);and a thickness of the plurality of light emitting layers is between 1 nm and 100 nm.
Preferably, the ionic conjugated polyelectrolyte is a cationic conjugated polyelectrolyte, and the cationic conjugated polyelectrolyte has a structural formula of
Specifically, the thickness of the plurality of electron transport layers 80 is between 0.5 nm and 10 nm.
Preferably, the material of the metal microparticles is silver (Ag).
Specifically, the thickness of the cathode 90 is between 10 nm and 200 nm.
Preferably, the top of the pixel definition layer 40 is a rough surface, facilitating to realize the attachment of the cathode 90 on the surface thereof.
The hole injection layer 50, the hole transport layer 60, the light emitting layer 70, the electron transport layer 80, and the cathode 90 in the all-solution OLED device are all fabricated by the solution film-forming method; compared with the existing OLED device, the fabrication cost is low, the film-forming quality is high, and the display quality is excellent.
In summary, the disclosure provides an all-solution OLED device and a manufacturing method thereof. The manufacturing method of the all-solution OLED device of the disclosure adopts the solution film-forming method to fabricate the hole injection layer, the hole transport layer, the light emitting layer, the electron transport layer and the cathode. Compared with the manufacturing method of the existing OLED device, an all-solution preparation of the electron transport layer and the cathode is achieved, the use of high vacuum evaporation process and equipment can be avoided, thereby saving materials and reducing manufacturing costs; and the adjacent layers will not appear mutual solubility, so the film quality is high and the performance of the device can be improved. The hole injection layer, the hole transport layer, the light emitting layer, the electron transport layer, and the cathode are all fabricated by solution film-forming; compared with the existing OLED device, the fabrication cost is low, the film-forming quality is high, and the display quality is excellent.
The invention is defined by the appended claims.

Claims

A manufacturing method of an all-solution organic light emitting diode (OLED) device, comprising:
providing a TFT backplane (1), wherein the TFT backplane (1) comprises a base substrate (10), a TFT array layer (20) disposed on the base substrate (10), a plurality of anodes (30) disposed on the TFT array layer (20) and disposed at intervals, and a pixel definition layer (40) disposed on the TFT array layer (20) and the plurality of anodes (30), wherein the pixel definition layer (40) comprises a plurality of openings (41) respectively corresponding to the plurality of anodes (30);

providing an ink of a hole injection layer, performing a solution film formation on the plurality of anodes (30) in the plurality of openings (41) respectively by ink-jet printing or coating, and forming a plurality of hole injection layers (50) by drying and removing a solvent;

providing an ink of a hole transport layer, performing a solution film formation on the plurality of hole injection layers (50) in the plurality of openings (41) respectively by ink-jet printing or coating, and forming a plurality of hole transport layers (60) by drying and removing a solvent;

providing an ink of a light emitting layer, performing a solution film formation on the plurality of hole transport layers (60) in the plurality of openings (41) respectively by ink-jet printing or coating, and forming a plurality of light emitting layers (70) by drying and removing a solvent;

providing an ink of an electron transport layer, performing a solution film formation on the plurality of light emitting layers (70) in the plurality of openings (41) respectively by ink-jet printing or coating, and forming a plurality of electron transport layers (80) by drying and removing a solvent;

wherein the ink of the electron transport layer comprises a material of the electron transport layer and a solvent thereof, and the material of the electron transport layers (80) is an ionic conjugated polyelectrolyte, and the solvent is an alcohol solvent; and

providing a metal paste material, performing an entire surface of solution film formation on the plurality of electron transport layers (80) in the pixel definition layer (40) and the plurality of openings (41) respectively by ink-jet printing or coating, and forming a continuous uninterrupted cathode (90) by drying and removing a solvent;

wherein the metal paste material comprises metal microparticles, a binder, a solvent, and an auxiliary agent;

wherein the hole injection layer (50), the hole transport layer (60), the light emitting layer (70), the electron transport layer (80), and the cathode (90) are structural layers, and at least two of adjacent ones of the structural layers are both dried by heating, a heating temperature of one of the structural layers of a back-end process is less than a heating temperature of another one of structural layers of a front-end process; and

wherein the ink of the light emitting layer comprises a light emitting layer material and a solvent thereof, the light emitting layer material is a blue light emitting material, and the blue light emitting material comprises poly(9,9-di-n-octylfluorenyl-2,7-diyl), and the solvent is chlorobenzene.
The manufacturing method of the all-solution OLED device according to claim 1, wherein
areas of the plurality of openings (41) are respectively smaller than areas of the plurality of anodes (30); the plurality of openings (41) respectively correspond to a plurality of pixel regions; a material of the plurality of anodes (30) is indium tin oxide; the plurality of anodes (30) are fabricated by way of magnetron sputtering film formation, and a film thickness of the plurality of anodes (30) is between 20 nm and 200 nm;

wherein the ink of the hole injection layer is a PEDOT: PSS aqueous solution; a solution film-forming method of the plurality of hole injection layers (50) is ink-jet printing; a drying method of the plurality of hole injection layers (50) comprises one or two of vacuum drying and heat drying; and a thickness of the plurality of hole injection layers (50) is between 1 nm and 100 nm.
The manufacturing method of the all-solution OLED device according to claim 1, wherein
the ink of the hole transport layer comprises a material of the hole transport layer and a solvent thereof, the material of the hole transport layers (60) is poly (N,N'-bis(4-butylphenyl)-N,N'-bis (phenyl)benzidine), and the solvent is an organic solvent; a solution film-forming method of the plurality of hole transport layers (60) is ink-jet printing; a drying method of the plurality of hole transport layers (60) comprises one or two of vacuum drying and heat drying; and a thickness of the plurality of hole transport layers (60) is between 1 nm and 100 nm;

wherein a solution film-forming method of the plurality of light emitting layers (70) is ink-jet printing; a drying method of the plurality of light emitting layers (70) comprises one or two of vacuum drying and heat drying; and a thickness of the plurality of light emitting layers (70) is between 1 nm and 100 nm.
The manufacturing method of the all-solution OLED device according to claim 1, wherein
the ionic conjugated polyelectrolyte is a cationic conjugated polyelectrolyte and the cationic coniuaated polyelectrolyte has a structural formula of
and the alcohol solvent is methanol;

wherein a solution film-forming method of the plurality of electron transport layers (80) is ink-jet printing; a drying method of the plurality of electron transport layers (80) comprises one or two of vacuum drying and heat drying; and a thickness of the plurality of electron transport layers (80) is between 0.5 nm and 10 nm.
The manufacturing method of the all-solution OLED device according to claim 1, wherein
a solution film-forming method of the plurality of anodes (30) is ink-jet printing; a drying method of the plurality of anodes (30) comprises one or two of vacuum drying and heat drying; a thickness of the plurality of anodes (30) is between 10 nm and 200 nm; and a top of the pixel definition layer (40) is a rough surface.